Abstract:

The optimum technological parameters for supercritical fluid extraction (SFE) of oil from millet bran were investigated using orthogonal array design. Along with this, methyl esterified millet bran oil was analyzed for chemical composition by GC-MS and chemical compounds were quantitatively determined using an external calibration method. The optimal values of SFE parameters were extraction pressure 30 MPa and temperature 45 ℃for an extraction duration of 70 min. There were totally 18 compounds identified in millet bran oil with the following relative contents: hexatriacontane 28.42%, 2,6-Di-tert-butyl-4-methylphenol 19.6%, methyl oleate 7.77%, 2,4-Di-tert-butyl-6-methylphenol 6.06%, and methyl linoleate 5.16%.

Key words: millet bran oil, GC-MS, supercritical carbon dioxide fluid, extraction